[Getting Started] Explain the subwoofer in the home theater

[Home Theater Network HDAV.com.cn] What does the subwoofer mean? How to choose an entry-level subwoofer? This is undoubtedly very difficult for many users who have just touched the sound system. But when you get here, you don't have to worry about it. The following is a systematic introduction to the introduction of the subwoofer, and how to choose a good subwoofer. Interested friends, don't go away.

First, what is the subwoofer?

A subwoofer, also known as a subwoofer, is used to enhance the bass output of a wideband speaker and a type of speaker that tries to make the bass deeper. With it, the restoration of the program source can be made more robust. Without it, it gives people a feeling of lack of strength and energy. The high-pitched gun reflects the details of the sound.

Second, the principle of the subwoofer

The internal power amplifier circuit divides the sound into several frequency segments through the frequency divider, the output of the medium and high frequency segments to the satellite speakers, and the output of the low frequency band to the low frequency.

Generally, the subwoofer emits a low-frequency sound of 20-200 Hz. When the energy is not very strong, it is difficult for people to hear, and it is difficult to distinguish the direction of the sound source. Such low-frequency sound is transmitted through the inverted phase hole, and the satellite horn speaker resonates with the low frequency. The combination of the weak bass produced by the speaker and the satellite speaker, the satellite speaker will re-release the bass to release the bass, so the bass effect is very shocking, and the feeling is from the satellite speaker.

Third, the role of the subwoofer

Adding a subwoofer (especially active) to the original sound system will increase the dynamic range of the system and make the low frequency dive deeper. At the same time, the transparency of the intermediate frequency will be better, and the sound will be more unrestricted and more vivid.

Thanks to the increased power and woofer, the sound system can reproduce the peak of the music at a higher level. And because the main speaker is no longer responsible for the playback of the bass, it can be played in a louder sound. Moreover, the cone of the woofer of the main speaker no longer needs to be moved forward and backward as before, so the midrange will be clearer when used for reproducing music.

however. There are advantages and disadvantages, and the subwoofer also has its disadvantages. From the perspective of listening to music, adding a subwoofer tends to degrade the performance of the sound system when playing back music. The reason is that most of the subwoofers are not well designed; they are not properly erected; or they are designed to be quite powerful when used in home theater systems.

In short, it is not intended to let people hear the subtleties in the music.

Fourth, the classification of the subwoofer

Subwoofers can be divided into passive subwoofers and active subwoofers.

1, passive subwoofer

The passive subwoofer only has one or a few subwoofers in the speaker, which is no different from a normal speaker. Only need to use an additional power amplifier to push. But there are also some subwoofers that can share a power amplifier with other speakers.

In this forced home mode, the wideband output of the power amplifier is also added to the subwoofer, and the crossover network in the subwoofer is used to split the low frequency signal from the audio signal and add the rest of the filtering. To the main speaker, this method needs to add a crossover network that filters the speaker level signal to the signal stroke.

2, active subwoofer

The active subwoofer combines a subwoofer with a line-level crossover network and a power amplifier in the same speaker, eliminating the need for additional chassis and additional power amplifiers. This speaker has a line level input for the preamplifier input signal to drive the line level output of the power amplifier and the volume control of the speaker.

Five, the evaluation index of the subwoofer

1, power:

It determines the maximum sound intensity that the subwoofer can emit. Need to look at the rated power, you can also ask the power amplifier module model, and then query the output power of the module, which is the output power of the speaker. At present, there are two kinds of power annotation methods for subwoofer speakers: rated power and peak power. Signal to noise ratio: the higher the better.

2, box material

The current subwoofer speaker materials are divided into plastic and wood. The speaker of wood material was generally considered to be superior to the speaker of plastic, but the current idea is not perfect. Some of the well-made plastic speakers have far better sound quality than the shoddy wooden speakers. Therefore, the 掂 component is a very important step when selecting a speaker. If a large wooden speaker is very light, then its performance will not be good.

3, diaphragm material

The diaphragm material refers to the material from which the diaphragm of the speaker is manufactured. Among them, the diaphragm of the tweeter is made of plastic film, silk film and metal film; the diaphragm of the woofer is made of paper cone, polyethylene basin, wool basin, aluminum-magnesium alloy basin and bulletproof cloth basin. These materials have different performances and prices are high and low. It is difficult to say who is better or worse, like string, choose paper cones, wool basins, metal music selection, polyethylene basins, bulletproof cloth basins, southern paper cones, wool basins Less choice, easy to absorb moisture, change the sound quality.

4, speaker unit caliber

The diameter of the speaker unit (bass part) is generally between 2 and 6 inches. In this range, the larger the aperture, the higher the sensitivity and the better the low frequency response.

Six, subwoofer purchase considerations

1, the subwoofer volume is not the bigger the better

Beginners buy subwoofers, many think that the bigger the better, this is actually not the case. The larger the unit's subwoofer, although theoretically can bring lower dive and volume, but that is theoretical. A 15-inch 2,000-yuan subwoofer, no matter the data or the sense of hearing, is hard to beat a 12-inch 8000-yuan subwoofer. Therefore, the more you get into the subwoofer, it is recommended that you choose a small gun instead.

Because of the same price, small-sized product materials are more adequate than large ones, and smaller unit sounds are easier to control. Cheap big-size subwoofer, advise you not to buy it!

This is big enough and cheap, and it is a waste in home theater!

2, the greater the power, the better

The greater the power, the better the ability to push and the unit control. When selecting a subwoofer, pay attention to its standard RMS power, which means that the subwoofer power amplifier can stabilize the rated output power for a long time. And many subwoofers with an RMS power of 300W often have a dynamic power standard of 600W or 700W. Dynamic power refers to the power output that the subwoofer can achieve in a short time. Look at this indicator, don't be too persistent.

In addition, as the big-name subwoofer manufacturer's JL, it is not honest in the labeling. For example, the popular product JL F113, enthusiasts basically think that this product is 2500W RMS rated power products, but in fact on the official page number we found such a word game - 2500W RMS short-term, which shows that the RMS rated power is short Time, I can only understand that this is a way of labeling premature ejaculation, it is ridiculous.

3, the low frequency response is not as low as possible

The wider the low-tone indicator is the focus of many small white users to choose the subwoofer. There are subwoofers everywhere, claiming that they can make the dive to 15Hz, 10Hz. In fact, this is meaningless. Among the Blu-ray discs that are viewed, the recorded subwoofer channel signals are mostly 20Hz~120Hz (Dolby Track) and 20Hz~80Hz (DTS Track). We don't know where the signals that are played back below 20Hz come from.

4, the subwoofer must be heavy

Of course, the premise is that it is not a brick inside. The weight of the subwoofer consists of the unit, the cannon and the cabinet. The heavier the unit, the stronger the basin and the larger the magnet. More fresh and fun home theater information, please pay attention to home theater network http:// (WeChat: cnhifi), the country's most influential home theater audio player interactive media website.

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